<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <script>
    // alert(`你好，js~`)
    // document.write(`JavaScript我来了！`)
    // console.log(`它~会魔法把~`)
    // let age
    // age=18;
    // let age=18;//变量的初始化
    // document.write(age)
    // console.log(age)

    let num = 20
    let uname = `张三`//变量的初始化
    console.log(num)
    console.log(uname)
    let num=20
    console.log(num)
    // </script>
</body>
</html>